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CA2121855A1 - Metallic pipe corrosion and stress resistant coating - Google Patents

Metallic pipe corrosion and stress resistant coating

Info

Publication number
CA2121855A1
CA2121855A1 CA002121855A CA2121855A CA2121855A1 CA 2121855 A1 CA2121855 A1 CA 2121855A1 CA 002121855 A CA002121855 A CA 002121855A CA 2121855 A CA2121855 A CA 2121855A CA 2121855 A1 CA2121855 A1 CA 2121855A1
Authority
CA
Canada
Prior art keywords
layer
coating
melt
hot
mils
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002121855A
Other languages
French (fr)
Other versions
CA2121855C (en
Inventor
Glen Garneau
Rudy Garneau
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA2121855A priority Critical patent/CA2121855C/en
Publication of CA2121855A1 publication Critical patent/CA2121855A1/en
Application granted granted Critical
Publication of CA2121855C publication Critical patent/CA2121855C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • B29C65/54—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive between pre-assembled parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1054—Coatings characterised by the materials used by rubber or plastics the coating being placed outside the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/18—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings
    • F16L58/181—Protection of pipes or pipe fittings against corrosion or incrustation specially adapted for pipe fittings for non-disconnectable pipe joints

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Laminated Bodies (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The present invention provides a coating for metallic pipes having improved corrosion and soil stress resistance, and adapted for both in-the-mill and over-the-ditch application to said pipes, which coating comprises:a first layer comprising a hot-melt rubberized adhesive applied to the outer surface of a pipe preheated to a temperature of 25°-60°C, said hot-melt rubberized adhesive comprising a physical blend or mixture of materials chosen from the group of asphaltenes, elastomers, rubbers, resins, polymers and copolymers, optionally including fillers, said hot-melt rubberized adhesive having the following physical properties: Ring and Ball softening temperature : 75° -95°C. Flow Properties, as defined by CSA Z 245.21 Spec: 1-12 mm. Viscosity at 175°C : 10,000 - 100,000 cPs; and a second layer applied over the first layer, said second layer comprising a polyolefin material. Also described herein is a method for applying such coating to a metallic pipe surface. The pipe surface is first cleaned and the pipe is then preheated to a temperature of 25 - 60°C; then hot-melt rubberized adhesive, heated to a temperature above its melting point, is applied to the preheated pipe as a first layer, and immediately thereafter a second layer comprising a polyolefin material, preferably in the form of a tape, is applied over the first layer. The pipeline coating of the present invention is especially suitable for pipeline rehabilitation.

Claims (17)

1. An in-the-mill or over-the-ditch method for coating a metallic pipe to impart improved corrosion and soil stress resistance thereto, which comprises: preheating said pipe to a temperature of 25°-60°C, applying to said preheated pipe a first layer comprising a hot-melt rubberized adhesive preheated to a temperature above its melting point, said hot-melt rubberized adhesive comprising a physical blend or mixture of materials chosen from the group of asphaltenes, elastomers, rubbers, resins, polymers and copolymers, optionally including fillers, said hot-melt rubberized adhesive having the following physical properties:
Ring and Ball softening temperature: 75°-95°C
Flow Properties, as defined by CSA Z 245.21 Spec: 1-12mm Viscosity at 175°C : 10,000 - 100,000 cPs; and then applying over said first layer, for mechanical stress resistance, a second layer comprising a polyolefin material.
2. A method according to claim 1 wherein the pipe is preheated to a temperature of 45 - 60°C.
3. The method of claim 1, wherein the first layer forms a continuous coating from 0.25 mm to 0.5 mm (10 to 20 mils) in thickness and the second layer forms a coating at least 0.89 mm (35 mils) in thickness.
4. The method of claim 3, wherein the second layer is applied by spirally wrapping a tape of polyolefin material over the first layer.
5. The method of claim 4, wherein the polyolefin material is polyethylene.
6. A coating for metallic pipes having improved corrosion and soil stress resistance, and adapted for both in-the-mill and over-the-ditch application to said pipes, which coating comprises:
a first layer comprising a hot-melt rubberized adhesive applied to the outer surface of a pipe preheated to a temperature of 25°-60°C, said hot-melt rubberized adhesive comprising a physical blend or mixture of materials chosen from the group of asphaltenes, elastomers, rubbers, resins, polymers and copolymers, optionally including fillers, said hot-melt rubberized adhesive having the following physical properties:
Ring and Ball softening temperature : 75° - 95°C
Flow Properties, as defined by CSA Z 245.21 Spec: 1-12 mm Viscosity at 175°C : 10,000 - 100,000 cPs; and a second layer applied over the first layer, said second layer comprising a polyolefin material.
7. The coating of claim 6, wherein the first layer forms a continuous coating from 0.25 mm to 0.5 mm (10 mils to 20 mils) in thickness and the second layer forms a coating at least 0.89 mm (35 mils) in thickness.
8. The coating of claim 7, wherein the second layer is a tape of polyolefin material, spirally wrapped over the first layer.
9. The coating of claim 8, wherein said polyolefin is polyethylene.
10. A coated metallic pipe having an improved corrosion and soil stress resistance coating, said coating comprising:
a first layer comprising a hot-melt rubberized adhesive, applied to the outer surface of a pipe preheated to a temperature of from 25° to 60°C, said hot-melt rubberized adhesive comprising a physical blend or mixture of materials chosen from the group of asphaltenes, elastomers, rubbers, resins, polymers and copolymers, optionally including fillers, said hot-melt rubberized adhesive having the following physical properties:
Ring and Ball softening temperature: 75° - 95°C
Flow Properties, as defined by CSA Z 245.21 Spec: 1-12 mm Viscosity at 175°C : 10,000 - 100,000 cPs; and a second layer comprising a polyolefin material applied over the first layer.
11. A coated metallic pipe of claim 10, wherein the first layer forms a continuous coating from 0.25 mm to 0.5 mm (10 mils to 20 mils) in thickness and the second layer forms a coating at least 0.89 mm (35 mils) in thickness.
12. A coated metallic pipe of claim 11, wherein the second layer is a tape of polyolefin material, spirally wrapped over the first layer.
13. A coated metallic pipe of claim 12, wherein said polyolefin is polyethylene.
14. A coating according to claim 6 which has the following properties:

Adhesive Properties:
Softening Point (ring and ball) . . . . 85°C average Adhesive Flow Test (71°C, 1 h) . . . . 2 - 8 mm average Coating Properties:
Peel Adhesion at 23°C (Instron) Cross head speed 10 mm/minute . . 3.5kg/25mm average Peel Adhesion (hanging weight, per CSA Z245.21) 2.0 kg . . . . . . . . . . . . . . 5mm/min/25mm 2.5 kg . . . . . . . . . . . . . . 7mm/min/25mm 3.0 kg . . . . . . . . . . . . . . 10mm/min/25mm 3.5 kg . . . . . . . . . . . . . . 15mm/min/25mm Cathodic Disbondment (CSA Z.245.21) 28 days, 23°C, 1.5V . . . . . . . 10 mm Radius 14 days, 65°C, 1.5V . . . . . . . 8 mm Radius 48 hour, 65°C, 1.5V . . . . . . . 6 mm Radius Impact Test, 23°C . . . . . . . . . . . 4.0 J/mm Bend Test, CSA Z.245.21 . . . . . . . . No cracking Outdoor Exposure (ASTM B-53) . . . . . 2 years min.

Polyethylene Tensile strength . . . . . 12 MPa Polyethyleno Tape Elongation . . . . . 200%

Minimum coating thickness in millimetres (mils):
Diameter (in): 3 - 8 10 and up (mm): 89 - 219 273 and up Adhesive: 0.25 (10) 0 30 (12) Polyethylene:
one layer 0.89 (35 mils) 0.89 (35 mils)
15. A method according to claim 1 wherein the hot-melt rubberized adhesive is preheated to a temperature of 150° -175°C.
16. A coating according to claim 6 wherein the second layer has a minimum thickness of 0.6 mm.
17. A coated metallic pipe according to claim 10 wherein the second layer has a minimum thickness of 0.6 mm.
CA2121855A 1994-04-21 1994-04-21 Metallic pipe corrosion and stress resistant coating Expired - Lifetime CA2121855C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2121855A CA2121855C (en) 1994-04-21 1994-04-21 Metallic pipe corrosion and stress resistant coating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA2121855A CA2121855C (en) 1994-04-21 1994-04-21 Metallic pipe corrosion and stress resistant coating

Publications (2)

Publication Number Publication Date
CA2121855A1 true CA2121855A1 (en) 1995-10-22
CA2121855C CA2121855C (en) 2010-12-21

Family

ID=4153429

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2121855A Expired - Lifetime CA2121855C (en) 1994-04-21 1994-04-21 Metallic pipe corrosion and stress resistant coating

Country Status (1)

Country Link
CA (1) CA2121855C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2743330A1 (en) * 1996-01-10 1997-07-11 Atochem Elf Sa COATING OF METAL SURFACES

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2743330A1 (en) * 1996-01-10 1997-07-11 Atochem Elf Sa COATING OF METAL SURFACES
WO1997025202A1 (en) * 1996-01-10 1997-07-17 Elf Atochem S.A. Coating of metal surfaces

Also Published As

Publication number Publication date
CA2121855C (en) 2010-12-21

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Effective date: 20140422